本文目录一览:
- 1、在java语言中多少表示y,多少表示n
- 2、用Java语言定义复数类Complex,必须满足如下要求:
- 3、用JAVA定义个复数类
- 4、使用JAVA编程实现复数类ComplexNumber
- 5、在java中复数的结构包括实部和虚部?什么是实部什么是虚部?
- 6、java中怎样表示一个无穷大?无穷小
在java语言中多少表示y,多少表示n
大写的Y是89,大写的N是78.
小写的y是121,小写的n是110.
记住小写的a是97,大写的A是65就可以,后面的字母依次类推。
用Java语言定义复数类Complex,必须满足如下要求:
public class Complex{
public int RealPart;
public int ImaginPart;
public Complex(){
this.RealPart = 0;
this.ImaginPart = 0;
}
public Complex(int r, int i){
this.RealPart = r;
this.ImaginPart = i
}
public Complex complexAdd(Complex a){
this.RealPart += a.RealPart;
this.ImaginPart += a.ImaginPart;
//这里返回什么?复数值是指哪个?还是复数对象?没有说清楚。我这里返回复数对象。
return this;
}
public String ToString(){
return ""+this.RealPart + this.ImaginPart;//return "" + 1 + 2 = "12";不知道这里要求是不是这样。有些话写的我没法理解。你的a + bi是个啥?如果是返回实数和虚数的和就给 1 + 2的部分加上括号。
}
}
用JAVA定义个复数类
public class Complex {
private double x;//实部
private double y;//虚部
public Complex(){}
/**构造函数
* @param x 实数部分
* @param y 虚数部分
*/
public Complex(double x,double y){
super();
this.x = x;
this.y = y;
}
/**求模
* @return 该复数的模
*/
public double mod(){
return x * x + y * y;
}
/**复数间加法
* @param complex 加数
* @return 计算结果
*/
public Complex add(Complex complex){
double x = this.x + complex.x;
double y = this.y + complex.y;
return new Complex(x,y);
}
/**复数与实数的加法
* @param a 加数
* @return 计算结果
*/
public Complex add(double a){
return this.add(new Complex(a,0));
}
/**复数间减法
* @param complex 减数
* @return 计算结果
*/
public Complex subtract(Complex complex){
double x = this.x - complex.x;
double y = this.y - complex.y;
return new Complex(x,y);
}
/**复数与实数的减法
* @param a 减数
* @return 计算结果
*/
public Complex subtract(double a){
return subtract(new Complex(a,0));
}
/**复数间乘法
* @param complex 乘数
* @return 计算结果
*/
public Complex multiply(Complex complex){
double x = this.x * complex.x - this.y * complex.y;
double y = this.y * complex.x + this.x * complex.y;
return new Complex(x,y);
}
/**复数间除法
* @param complex 除数
* @return 计算结果
*/
public Complex divide(Complex complex){
double x = (this.x * complex.x + this.y * complex.y) / (complex.mod());
double y = (this.y * complex.x - this.x * complex.y) / (complex.mod());
return new Complex(x,y);
}
public String toString(){
StringBuffer sb = new StringBuffer();
if(x != 0){
sb.append(x);
if(y 0){
sb.append("+" + y + "i");
}else if(y 0){
sb.append(y + "i");
}
}else{
if(y != 0){
sb.append(y + "i");
}
}
if(x == 0 y == 0){
return "0";
}
return sb.toString();
}
public double getX() {
return x;
}
public void setX(double x) {
this.x = x;
}
public double getY() {
return y;
}
public void setY(double y) {
this.y = y;
}
public static void main(String[] args) {
Complex a = new Complex(2,0.5);
Complex b = new Complex(0.5,2);
System.out.println("(" + a + ")+(" + b + ")=" + a.add(b));
System.out.println("(" + a + ")+" + 2 + "=" + a.add(2));
System.out.println("(" + a + ")-(" + b + ")=" + a.subtract(b));
System.out.println("(" + a + ")-" + 2 + "=" + a.subtract(2));
System.out.println("(" + a + ")*(" + b + ")=" + a.multiply(b));
System.out.println("(" + a + ")/(" + b + ")=" + a.divide(b));
}
}
使用JAVA编程实现复数类ComplexNumber
import java.applet.Applet;
import java.awt.Button;
import java.awt.Label;
import java.awt.TextField;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
public class ComplexTest extends Applet implements ActionListener{
Label firstReal, firstImg;
TextField firstRealNum, firstImgNum;
Label secondReal, secondImg;
TextField secondRealNum, secondImgNum;
Button add = new Button("Add");
Button subtract = new Button("Subtract");
TextField addResult, subtractResult;
public void init(){
firstReal = new Label("First Complex Real Number: ");
firstRealNum = new TextField(7);
super.add(firstReal);
super.add(firstRealNum);
firstImg = new Label("First Complex Imaginary Number: ");
firstImgNum = new TextField(7);
super.add(firstImg);
super.add(firstImgNum);
secondReal = new Label("Second Complex Real Number: ");
secondRealNum = new TextField(7);
super.add(secondReal);
super.add(secondRealNum);
secondImg = new Label("Second Complex Imaginary Number: ");
secondImgNum = new TextField(7);
super.add(secondImg);
super.add(secondImgNum);
super.add(add);
addResult = new TextField(7);
super.add(addResult);
super.add(subtract);
subtractResult = new TextField(7);
super.add(subtractResult);
add.addActionListener(this);
subtract.addActionListener(this);
}
public void actionPerformed(ActionEvent e) {
double firstComplxReal = Double.parseDouble(firstRealNum.getText());
double firstComplxImg = Double.parseDouble(firstImgNum.getText());
double secondComplxReal = Double.parseDouble(secondRealNum.getText());
double secondComplxImg = Double.parseDouble(secondImgNum.getText());
ComplexNumber complxNum1 = new ComplexNumber(firstComplxReal, firstComplxImg);
ComplexNumber complxNum2 = new ComplexNumber(secondComplxReal, secondComplxImg);
addResult.setText(complxNum1.add(complxNum2).toString());
subtractResult.setText(complxNum1.subtract(complxNum2).toString());
}
}
class ComplexNumber{
private double real;
private double imaginary;
public ComplexNumber(double realNum, double imaginaryNum){
this.real = realNum;
this.imaginary = imaginaryNum;
}
// (a+bi) + (c+di) = (a+b) + (c+d)i
public ComplexNumber add(ComplexNumber complexNum2){
double newRealPart = this.real + complexNum2.getReal();
double newImgPart = this.imaginary + complexNum2.getImaginary();
return new ComplexNumber(newRealPart, newImgPart);
}
//(a+bi) - (c+di) = (a-b) - (c-d)i
public ComplexNumber subtract(ComplexNumber complexNum2){
double newRealPart = this.real - complexNum2.getReal();
double newImgPart = this.imaginary - complexNum2.getImaginary();
return new ComplexNumber(newRealPart, newImgPart);
}
public double getImaginary() {
return imaginary;
}
public void setImaginary(double imaginary) {
this.imaginary = imaginary;
}
public double getReal() {
return real;
}
public void setReal(double real) {
this.real = real;
}
public String toString(){
return real + "+" + imaginary + "i";
}
}
在java中复数的结构包括实部和虚部?什么是实部什么是虚部?
复数是形如
a+bi
的数,
其中
a,
b
是实数,a称为实部,b称为虚部,i是虚数单位,
i^2
=
-1.
实数可以用一条直线(数轴)上的点表示,
类似地,
复数可以用一个平面(称为复平面)上的点表示.
在复平面上,a+bi
用点Z(a,b)
表示。Z与原点的距离r称为Z的模|Z|=√(a^2+b^2)
复数a+bi,b=0为实数,b不等于0为虚数,
a=0且b不等于0时为纯虚数。
复数的三角形式是
Z=r(cosx+isinx)
中x,r是实数,rcosx称为实部,rsinx称为虚部,i是虚数单位。Z与原点的距离r称为Z的模,x称为辐角。
java中怎样表示一个无穷大?无穷小
Java中提供了三个特殊的浮点数值:正无穷大、负无穷大、非数,用于表示溢出和出错。
正无穷大:用一个正数除以0将得到一个正无穷大,通过Double或Float的POSITIVE_INFINITY表示。
负无穷大:用一个负数除以0将得到一个负无穷大,通过Double或Float的NEGATIVE_INFINITY表示。
非数:0.0除以0.0或对一个负数开放将得到一个非数,通过Double或Float的NaN表示。
所有的正无穷大的数值都是相等的,所有的负无穷大的数值都是相等;而NaN不与任何数值相等,甚至和NaN都不等。
public class javaLesson5
{
public static void main(String[] args)
{
float af = 5.2325556f;
//下面将看到af的值已经发生改变,显示结果为5.2325554.
System.out.println(af);
double a = 0.0;
double c = Double.NEGATIVE_INFINITY;
float d = Float.NEGATIVE_INFINITY;
//将看到float和double的负无穷大是相等的。显示结果为:true。
System.out.println(c == d);
//0.0除以0.0将出现非数。显示结果为:NaN。
System.out.println(a / a);
//两个非数之间是不相等的。显示结果为:false。
System.out.println(a == Float.NaN);
//所有正无穷大都是相等的。显示结果为:true。
System.out.println(6.0 / 0 == 555.0/0);
//负数除以0.0将得到负无穷大。显示结果为:-Infinity
System.out.println(-8 / a);
//下面代码将抛出除以0的异常。
//System.out.pintln(0 / 0);
}
}